A novel MRI index for paraspinal muscle fatty infiltration: reliability and relation to pain and disability in lumbar spinal stenosis: results from a multicentre study by Hasan Banitalebi, Jørn Aaen, Kjersti Storheim, Anne Negård, Tor Åge Myklebust, Margreth Grotle, Christian Hellum, Ansgar Espeland, Masoud Anvar, Kari Indrekvam, Clemens Weber, Jens Ivar Brox, Helena Brisby, Erland Hermansen

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